Petrographic and compositional characterization of mafic minerals associated with mafic-ultramafic plutonic bodies of Cretaceous age of the Serra do Mar and Arco de Ponta Grossa Alkaline Provinces

• Grant number: 24/14397-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2024
• End date: August 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Excelso Ruberti
• Grantee: Fernanda Alves de Araújo
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 19/22084-8 - The Paraná Magmatic Province: petrogenesis, chronology and environmental impact of Cretaceous tholeiitic, alkaline and silicic magmatism in the Brazilian Platform, AP.TEM

Abstract

The detailed study of mafic mineral phases in igneous rocks, involving physical and chemical aspects, has been very important for understanding petrological processes and estimating intensive parameters such as temperature, pressure, oxygen fugacity and silica activity of different magmatic types. The study mainly involves petrographic characterization, mineral chemistry analyzes using techniques such as electron microprobe and laser ablation-ICP-MS on mafic minerals from alkaline-tending cumulate rocks, especially clinopyroxene. Focus will be given especially to one of the intrusions of the collection that has sampling control. From the data obtained, integration with previous data will allow for detailed discussions of petrological processes related to magma chamber dynamics.